KeraFirm Review: Ingredients, Price and What to Know Before Buying

Updated 2026-10-08 · Earthmend Editorial Team

Disclosure: some links on this page are affiliate links. If you buy through them we may earn a commission, at no extra cost to you. This content is for information only and is not medical advice — talk to your doctor before starting any supplement.

Quick verdict: KeraFirm is a topical oil-based solution with a brush applicator and 13 listed ingredients, including undecylenic acid and tea tree oil. It is a cosmetic-style nail care product, not a proven fungus treatment, and pricing appears only in images.

KeraFirm is one of several brush-on nail serums sold through long video sales pages. This page sums up what the official website states in text, what independent health sources say about the main ingredients, and what is still unclear. We are an independent research team; we did not use the product, and nothing here replaces a visit to a doctor or podiatrist.

What is KeraFirm?

KeraFirm is a liquid nail and skin formula that, according to the official website, comes in bottles with a targeted brush system so it can be painted onto the nail and the skin around it. The sales page markets KeraFirm for people bothered by thick, discolored or brittle toenails and the skin around them.

The page labels KeraFirm "natural," "non-GMO" and "no stimulants." It does not name a manufacturer, a facility or a lab test in the text we read. KeraFirm is sold online through the BuyGoods retail platform.

What ingredients are in KeraFirm?

According to the official website, KeraFirm contains the following 13 ingredients. No amounts or percentages are given.

Because the label amounts are not published in text, there is no way to compare the concentration of undecylenic acid in KeraFirm with standard over-the-counter antifungal products.

Does undecylenic acid in KeraFirm have any research?

Undecylenic acid is the ingredient on the KeraFirm list with the clearest regulatory history. Under the U.S. federal rules for over-the-counter antifungal products (21 CFR 333.210), undecylenic acid and its salts are among the active ingredients allowed in products for athlete's foot and ringworm, at a total of 10% to 25%.

That rule covers skin infections such as athlete's foot. It does not cover nail infections. Nail fungus lives inside and under the hard nail plate, which is why MedlinePlus notes that over-the-counter creams and ointments usually do not help this condition.

What does research say about tea tree oil and the other oils?

The National Center for Complementary and Integrative Health (NCCIH) says only a few studies have looked at tea tree oil for nail fungus, and the research is too limited to draw conclusions. For athlete's foot, a small amount of research suggests a possible benefit, but tea tree oil may not work as well as standard treatments. NCCIH also warns that tea tree oil must never be swallowed and can irritate the skin in some people.

Clove, lavender, manuka and camphor oils have mostly been studied in lab dishes. Lab results do not show what happens when an oil is brushed onto a toenail. The carrier oils (flaxseed, almond, walnut, chia) mainly moisturize, and aloe vera and vitamin E are common soothing skin ingredients.

How much does KeraFirm cost?

The KeraFirm order section shows three packages: 2 bottles, 2 + 1 bottles, and 3 + 3 bottles. The price figures are shown as images, and the text price fields are empty, so we could not verify them. Check the current price on the official website before you order.

What the text does state:

• The 2-bottle package adds $9.99 shipping.
• The 6-bottle package lists free shipping. The 2 + 1 package is shown with both free shipping and $9.99 shipping in different spots, so confirm the shipping charge at checkout.
• International orders pay extra shipping fees.
• Three bonus guides are attached to the 6-bottle order, two of which cover topics unrelated to nails (skin flare-ups and joint flexibility).

Check the current KeraFirm price on the official site

Does KeraFirm have a money-back guarantee?

The KeraFirm page shows a guarantee badge image and links to a refund policy, but the text we read does not state the number of days. Read the refund policy and confirm the window at checkout before buying, and keep your order email.

Who might consider KeraFirm?

KeraFirm may appeal to adults who:

• want a cosmetic nail and cuticle oil with familiar ingredients like tea tree oil and undecylenic acid;
• already have a diagnosis from a clinician and want an extra routine for nail appearance, with their doctor's okay;
• prefer a brush-on product over a capsule.

Who should not use KeraFirm without medical advice?

• Pregnant or nursing women, and anyone under 18.
• People who take prescription medicines or have a medical condition (the official page itself says to consult a physician in these cases).
• People with diabetes, poor circulation or nerve damage in the feet. Foot problems can become serious quickly, so a podiatrist should check any nail change.
• Anyone allergic to tree nuts (the formula lists sweet almond and walnut oils) or sensitive to essential oils.

Do a small patch test on the skin first and stop if redness or burning appears.

Is KeraFirm a substitute for nail fungus treatment?

No. KeraFirm is not an approved drug for nail fungus. Prescription treatments exist, including oral terbinafine and itraconazole and topical efinaconazole, tavaborole and ciclopirox, as listed by the American Academy of Dermatology. A doctor or podiatrist can confirm the diagnosis with a nail sample, which matters because nail psoriasis and nail injuries can look the same. Our guide to nail fungus treatment options explains how these choices compare.

KeraFirm pros and cons

Pros

• The full ingredient list is published in text.
• Contains undecylenic acid, an ingredient with an established OTC role for athlete's foot.
• Easy brush-on format.

Cons

• No amounts for any ingredient, so strength is unknown.
• Prices shown only in images; shipping details conflict between packages.
• Guarantee length not stated in text.
• No published trial of the KeraFirm formula itself.
• Sold through a long video sales page with bonus ebooks on unrelated topics.

How does KeraFirm compare with Kerassentials?

KeraFirm and Kerassentials share several oils and the same package layout. We put them side by side in Kerassentials vs KeraFirm. If you prefer a clay-based option, see our TerraCalm ingredients page.

Visit the official KeraFirm website

Sources consulted: ecfr.gov, medlineplus.gov, nccih.nih.gov, aad.org.